染色体ペアリング中に複製されたDNA構成要素のメオシス特有のトランスクリプト: 系統遺伝スペクトル全体の同質性
Cell
|April 1, 1985
まとめ
独特のDNA配列は,半減期中に複製され,リリウムとマウスのzygRNAに転写されます. このジグRNAは中性細胞に特異的であり,その発現パターンは種を超えて保存されます.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- 細胞生物学 細胞生物学
背景:
- リリウムの特定のDNA配列 (ゲノムの0.1-0.2%) は,生前S相ではなく,生前S相で複製される.
- これらの配列は,染色体ペアリングの開始時に,ポリ(A) + RNA (zygRNA) に転写されます.
研究 の 目的:
- 中性細胞におけるジグRNAの性質と発現を調査する.
- zygRNAが他の種,特にマウスに保存されているかどうかを判断する.
主な方法:
- リリウム半細胞におけるDNA複製のタイミングの分析.
- ハイブリダイゼーション技術を用いたポリア) +RNAの検出と特徴付け.
- マウスの精子細胞核のS1核酵素消化により,zygDNAを分離する.
- ライリージグRNAとマウスジグDNAのハイブリッド化.
主要な成果:
- zygRNAは,リリウムのジゴテンの間に特定のDNA配列から転写されます.
- zygRNAは,非ミオティック組織や特定のミオティック段階 (レプトテンからミドパキテン) の外では検出されません.
- ネズミの精子細胞核には,リリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリリ,リリリリリリリリリ,リリリリリリリリ,リリリリリリリ,リリリリリリ,リリリリリ,リリリリリリ,リリリリリ,リリリリ,リリリリ,リリリ,リリリ,リリリ,リリリ,リリリ,リリリ,リリリ,リリリ,リリリ,リリリ,リリリ,リリ,リリ,リリ,リリ,リリ,リリ,リリ,リリリ,リリリ,リリリリ,リリリリ,リリリリ,リリリリ,リリリリリ,リリリリリ,リリリリリ,リリリリリリ,リリリリリ,リリリリリ,リリリリ,リリリリ,リリリ,リリ,リ,リ,リ,リ,リ.
- zygRNAはマウスの体組織に存在しないが,マウスの精子細胞の発現プロフィールは,リリウム半細胞の発現プロフィールを反映している.
結論:
- ジグRNAを含む保存されたメカニズムは,リリウムとマウスの両方でミオシスと染色体ペアリングの間に存在します.
- zygRNAは,潜在的に染色体ペアリングに関連した,メオティックなプロセスで役割を果たします.
- この研究は,種全体にわたって保存されている新種の中性調節性RNAのクラスを明らかにしています.
関連する概念動画
Gene Conversion
Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
Genome Copying Errors
DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their survival. Therefore, the copying errors are checked and repaired at three levels.
Gene Duplication and Divergence
The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are characterized.
Homologous Recombination
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
Gene Conversion
Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
Genetic Variation
Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles, which...
Genes exist in different versions called alleles, which...


